Use the dart:async Stream API thoroughly in Pub.

utils/tests/pub/oauth2_test.dart

Index: utils/tests/pub/oauth2_test.dart
diff --git a/utils/tests/pub/oauth2_test.dart b/utils/tests/pub/oauth2_test.dart
index 1c94c32e52b70618e43c035eebf0359ea9fbcb38..4f5373cd1156d02d4736d6d2244bb78fe758dcef 100644
--- a/utils/tests/pub/oauth2_test.dart
+++ b/utils/tests/pub/oauth2_test.dart
@@ -68,7 +68,7 @@ main() {
     confirmPublish(pub);
 
     server.handle('POST', '/token', (request, response) {
-      return consumeInputStream(request.inputStream).then((bytes) {
+      return wrapInputStream(request.inputStream).toBytes().then((bytes) {
         var body = new String.fromCharCodes(bytes);
         expect(body, matches(
             new RegExp(r'(^|&)refresh_token=refresh\+token(&|$)')));
@@ -209,7 +209,7 @@ void authorizePub(ScheduledProcess pub, ScheduledServer server,
 
 void handleAccessTokenRequest(ScheduledServer server, String accessToken) {
   server.handle('POST', '/token', (request, response) {
-    return consumeInputStream(request.inputStream).then((bytes) {
+    return wrapInputStream(request.inputStream).toBytes().then((bytes) {
       var body = new String.fromCharCodes(bytes);
       expect(body, matches(new RegExp(r'(^|&)code=access\+code(&|$)')));